MRI Pulse Sequences Quiz

SE uses RF pulses to rephase spins and eliminate inhomogeneity effects, while GE uses gradients to rephase spins and does not eliminate inhomogeneity effects.

It provides good image quality, is very versatile, allows true T2 weighting, and is sensitive to pathology.

They perform more than one phase encoding step and fill more than one line of k-space per TR by using multiple 180° rephasing pulses to produce a train of echoes.

<p>Short TE (10-30 ms), short TR (300-700 ms), with a typical scan time of 4-6 minutes.</p> Signup and view all the answers

<p>A short TE (20 ms) provides proton density weighting, while a long TE (80 ms+) provides T2 weighting.</p> Signup and view all the answers

<p>Scan times are relatively long.</p> Signup and view all the answers

<p>The primary advantage is that scan times are greatly reduced, allowing high-resolution matrices and multiple signal averages (NEX) to be used, thereby improving image quality.</p> Signup and view all the answers

<p>A disadvantage is that some flow and motion effects are increased, making it incompatible with some imaging options.</p> Signup and view all the answers

<p>In SS-FSE, all the lines of k-space are acquired in one repetition time (TR).</p> Signup and view all the answers

<p>Inversion recovery pulse sequences begin with a 180° inverting pulse, followed by a 90° excitation pulse applied at a time TI (time from inversion) later.</p> Signup and view all the answers

<p>Inversion recovery is usually used to suppress the signal from certain tissues in conjunction with long echo times (TEs) and T2 weighting.</p> Signup and view all the answers

<p>The highest turbo factor currently used in single shot imaging is 728.</p> Signup and view all the answers